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diff --git a/test/implicit/asynchronous-modification.py b/test/implicit/asynchronous-modification.py
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+++ b/test/implicit/asynchronous-modification.py
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+#!/usr/bin/env python
+#
+# __COPYRIGHT__
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
+
+"""
+Verify expected behavior when an implicit dependency is modified
+asynchronously (that is, mid-build and without our knowledge).
+
+Test case courtesy Greg Noel.
+"""
+
+import TestSCons
+
+_python_ = TestSCons._python_
+
+test = TestSCons.TestSCons()
+
+test.write(['SConstruct'], """\
+import SCons.Defaults
+env = Environment()
+env['BUILDERS']['C'] = Builder(action = Copy('$TARGET', '$SOURCE'),
+                               source_scanner = SCons.Defaults.CScan)
+env['BUILDERS']['Mod'] = Builder(action = r'%(_python_)s mod.py')
+Alias('seq', env.C('one.c'))
+Alias('seq', env.Mod('mod', 'mod.py'))
+Alias('seq', env.C('two.c'))
+Default('seq')
+""" % locals())
+
+test.write(['hdr.h'], """\
+/* empty header */
+""")
+
+test.write(['mod.py'], """\
+open('mod', 'w').write(open('mod.py', 'r').read())
+open('hdr.h', 'w').write("/* modified */\\n")
+""")
+
+test.write(['one.c'], """\
+#include "hdr.h"
+""")
+
+test.write(['two.c'], """\
+#include "hdr.h"
+""")
+
+# The first run builds the file 'one', then runs the 'mod' script
+# (which update modifies the 'hdr.h' file) then builds the file 'two'.
+test.run(arguments = 'seq')
+
+# The 'hdr.h' file had its original contents when 'one' was built,
+# and modified contents when 'two' was built.  Because we took a
+# look at 'hdr.h' once, up front, we think both files are out of
+# date and will rebuild both (even though 'two' is really up to date).
+#
+# A future enhancement might add some sort of verification mode that
+# would examine 'hdr.h' again when 'two' was built, thereby avoiding
+# the unnecessary rebuild.  In that case, the second line below
+# will need to change to "test.up_to_date(...)".
+test.not_up_to_date(arguments = 'one')
+test.not_up_to_date(arguments = 'two')
+
+# Regardless of what happened on the middle run(s), both files should
+# be up to date now.
+test.up_to_date(arguments = 'seq')
+
+test.pass_test()